Improvement in high-pressure hot-air engines



' STENBERG, -HIGH- P RESSURE HOT-A IR ENGINES." No 186,377 W 1 Patented Ian. 16, 1877'.

N.PETERS, PHOTO-LITHDGRAPHER, WASHINGTONv D, C,

UNITED STATES PATENT OFFICE.

OSCAR STENBERG, OF ZERBST, ASSIGNOR OF ONE-HALF HIS RIGHT TO GOTTFRIED SAOHSENBERG AND FRIEDRICH SAOHSENBERG, OF ROSS- LAU, GERMANY.

IMPROVEMENT IN HIGH-PRESSURE HOT-AIR ENGINES.

Specification forming part of Letters Patent No. 186,377, dated January 16, 1877 application filed August 16, 1876.

a specification In the accompanying drawings, Figure 1 is a longitudinal section. Fig. 2 is a top view. partly in section. Fig. 3 is a detached view of the fire-pot in section, and a portion of the main cylinder and the water cylinder or cooler.

The object of my invention is to simplify the construction of a hot air engine, and to secure the direct action of the air upon piston and crankshaft, and also to retain the air for considerable time in the cooler.

My invention consists of an isolator vibrating in the main cylinder, between the fire-pot or heater and the water cylinder or cooler, in combination with a rock shaft having a radial arm, provided with a curved or are shaped slot, both arranged to operate in connection with other devices, all of which will be understood by the following description.

In the drawings, the main cylinder is seen at A, with the vibrating isolator B and the piston 0 working therein. On the left is the furnace or fire chamber D, with the fire pot or heater E in the upper part thereof, and on the right hand is the crank-shaft F, Fig. 2, supported in the usual bearings and carrying two balance-wheels, G. Two connectingrods, H, extend from the crank-shaft F to the piston 0, Fig. 2, the action of which will be hereafter described.

The rock-shaft I has a radial lever, K, the upper end of which is pivoted to the isolatorrod L, which has some elasticity or spring action, so as to bend, and. thus accommodate itself to the motion of the lever when moved by the rock-shaft. One end of the rock-shaft carries a radial arm, M, the upper end of which has a curved or arc-shaped slot, which connects with and works on a crank pin, N, provided with an anti-friction roller. (Shown in dotted lines, Fig. l.)

The main cylinder A, the water-cylinder P, and the fire-pot or heater E are made of castiron, and connected, as shown in Fig. 3. The fire-pot is doubled back upon itself, or folded so as to give the greatest amount of heatingsurface. t t

The isolator B is made of wroughtiron, and arranged to vibrate to and fro between the fire and the cooler. On the left the open end of the hollow cylinder of the isolator extends into the fire-pot, nearly to the fold thereof.

The tirepot being heated, and the crankshaft F being placed on the dead-point, to the right, so that the air remains in the cool room, the engineer puts his hand upon one of the balance-wheels, and turns the same in the direction of the arrow in Fig. 1, and thus starts the engine. By the. motion of the piston O the air is compressed in the cool room, and when the compression is complete the isolator moves suddenly to the right, and drives the cooled and compressed air into the fire-pot or heater E. Then, as the air becomes heated, it expands with a double force and reacts up on the piston O, which thus gives power to move the crank-shaft F.

Having thus described my invention, I claim- The curved slot M in the arm M, in combination with the rock'shaft I, lever K, isolator B, piston G, crank-shaft F, andcrank-pin N, all arranged to operate substantially as set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

OSCAR STENBERG.

Witnesses BERTHOLD ROI, EDWARD P. MAGLEAN; 

